Power supply test system

ABSTRACT

A power supply test system for testing reliability of a power supply includes a test chamber, a temperature detecting unit, a control unit, a heating module, and a refrigerating module. The test chamber accommodates the power supply. The temperature detecting unit detects temperature signals in the test chamber. The control unit presets a predetermined temperature value and receives the temperature signals. The heating module receives a first control signal from the control unit when a value of the temperature signal is less than the predetermined temperature value. The heating module heats the test chamber. The refrigerating module receives a second control signal from the control unit when a value of the temperature signal is greater than the predetermined temperature value. The refrigerating module refrigerates the test chamber until the value of the temperature signal is equal to the predetermined temperature value.

BACKGROUND

1. Technical Field

The present disclosure relates to a power supply test system for testingreliability of a power supply.

2. Description of Related Art

Computer power supplies are capable of converting alternating currentinto direct current. The reliability of a power supply is measured bycomparing the input and the output voltages of the power supplies. Burnin testing is an important test in determining the reliability of thepower supply. A typical burn in test uses a test chamber to test a powersupply in a temperature of 50 Celsius degrees. However, the typical testchamber can test a large number of power supplies all at one time. Whenthe typical test chamber is used to test a few power supplies, the testchamber is being used inefficiently.

Therefore there is a need for improvement in the art.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the embodiments can be better understood with referenceto the following drawings. The components in the drawings are notnecessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the embodiments. Moreover, in thedrawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 is a block diagram of an embodiment of a power supply testsystem, the system includes a temperature detecting unit, a controlunit, a refrigerating module, a heating module, a decoding module, adisplay module, an alarm module, and a power module.

FIG. 2 is a circuit diagram of the temperature detecting unit, thecontrol unit, and the alarm module of FIG. 1.

FIG. 3 is a circuit diagram of the refrigerating module, the heatingmodule, and the power module of FIG. 1.

FIG. 4 is a circuit diagram of the decoding module and the displaymodule of FIG. 1.

DETAILED DESCRIPTION

The disclosure is illustrated by way of example and not by way oflimitation in the figures of the accompanying drawings in which likereferences indicate similar elements. It should be noted that referencesto “an” or “one” embodiment in this disclosure are not necessarily tothe same embodiment, and such references mean “at least one”.

FIG. 1 illustrates a power supply test system in accordance with anembodiment. The power supply test system is adapted to test reliabilityof a power supply 910 under a predetermined temperature in a testchamber 900. The power supply test system includes a temperaturedetecting unit 100, a control unit 200, a refrigerating module 300, aheating module 400, a decoding module 500, a display module 600, analarm module 700, and a power module 800. The temperature detecting unit100 is adapted to detect temperature signals in the test chamber 900,and transmit the temperature signals to the control unit 200. Thecontrol unit 200 is adapted to preset a predetermined temperature value.When a value of the temperature signal is less than the predeterminedtemperature value, the control unit 200 transmits a first control signalto the heating module 400, and the heating module 400 heats the testchamber 900. When the value of the temperature signal is greater thanthe predetermined temperature value, the control unit 200 transmits asecond control signal to the refrigerating module 300, and therefrigerating module 300 refrigerates the test chamber 900 until thevalue of the temperature signal is equal to the predeterminedtemperature value. The power module 800 is adapted to provide workingvoltages to the refrigerating module 300 and the heating module 400.

FIG. 2 to FIG. 4 illustrate a circuit diagram of the temperaturedetecting unit 100, the control unit 200, the refrigerating module 300,the heating module 400, the decoding module 500, the display module 600,the alarm module 700, and the power module 800. The control unit 200includes a micro controller having a first control signal outputterminal PA0, a plurality of second control signal output terminalsPA1-PA3, a power good signal input terminal PA4, an alarm signal outputterminal PA5, a serial data signal output terminal PB0, a clock signaloutput terminal PB1, and a temperature signal input terminal PC0. Thetemperature detecting unit 100, the refrigerating module 300, and theheating module 400 are positioned in the test chamber 900. Thetemperature detecting unit 100 transmits the temperature signals to thecontrol unit 200 via the temperature signal input terminal PC0. Thepower supply 910 includes a power good signal output terminalelectrically connected to the power good signal input terminal PA4. Whenthe power good signal input terminal PA4 cannot receive a power goodsignal from the power supply 910, the alarm signal output terminal PA5outputs an alarm signal to the alarm module 700 and the alarm module 700alarms.

The refrigerating module 300 includes a first relay, a firstrefrigerating unit 310, and a second refrigerating unit 320. The firstrelay includes a first winding unit M1, a first switch unit K1, and asecond switch unit K2. A first terminal of the first winding unit M1 iselectrically connected to the first control signal output terminal PA0to receive the first control signal. A second terminal of the firstwinding unit M1 receives a first DC voltage. First terminals of thefirst switch unit K1 and the second switch unit K2 are electricallyconnected to the power module 800 to receive a second DC voltage. Secondterminals of the first switch unit K1 and the second switch unit K2 areelectrically connected to the first refrigerating unit 310. Secondterminals of the first switch unit K1 and the second switch unit K2 areelectrically connected to the second refrigerating unit 320. In oneembodiment, the first DC voltage is +5V.

The heating module 400 includes a second relay, a third relay, a fourthrelay, a first heating unit 410, a second heating unit 420, and a thirdheating unit 430. The second relay includes a second winding unit M2 anda third switch unit K3. A first terminal of the second winding unit M2is electrically connected to the second control signal output terminalPA1 to receive the second control signal. A second terminal of thesecond winding unit M2 is grounded. A first terminal of the third switchunit K3 receives the second DC voltage. A second terminal of the thirdswitch unit K3 is grounded via the first heating unit 410. The firstheating unit 410 includes a plurality of thermal resistors R1-R3connected in parallel. The third relay includes a third winding unit M3and a fourth switch unit K4. A first terminal of the third winding unitM3 is electrically connected to the second control signal outputterminal PA2 to receive the second control signal. A second terminal ofthe third winding unit M3 is grounded. A first terminal of the fourthswitch unit K4 receives the second DC voltage. A second terminal of thefourth switch unit K4 is grounded via the second heating unit 420. Thesecond heating unit 420 includes a plurality of thermal resistors R4-R6connected in parallel. The fourth relay includes a fourth winding unitM4 and a fifth switch unit K5. A first terminal of the fourth windingunit M4 is electrically connected to the second control signal outputterminal PA3 to receive the second control signal. A second terminal ofthe fourth winding unit M4 is grounded. A first terminal of the fifthswitch unit K5 receives the second DC voltage. A second terminal of thefifth switch unit K5 is grounded via the third heating unit 430. Thethird heating unit 430 includes a plurality of thermal resistors R7-R9connected in parallel.

The decoding module 500 includes a plurality of registers U0-U3. Each ofthe plurality of registers U0-U3 includes two serial data inputterminals a1, a2, a clock signal input terminal a3 and a plurality ofdigital signal output terminals b1-b8. The serial data input terminalsa1, a2 of the register U0 are electrically connected to the serial datasignal output terminal PB0 of the micro controller. The serial datainput terminals a1, a2 of the register U1 are electrically connected tothe second digital signal output terminal b8 of the register U0. Theserial data input terminals a1, a2 of the register U2 are electricallyconnected to the second digital signal output terminal b8 of theregister U1. The serial data input terminals a1, a2 of the register U3are electrically connected to the second digital signal output terminalb8 of the register U2. The clock signal input terminals a3 of theplurality of registers U0-U3 are electrically connected to the clocksignal output terminal PB1 of the micro controller.

The display module 600 includes a plurality of eight-segment numeraltubes D0-D3. Each of the plurality of eight-segment numeral tubes D0-D3includes a plurality of digital signal input terminals c1-c8. Theplurality of digital signal input terminals c1-c8 of the plurality ofeight-segment numeral tubes D0-D3 are electrically connected to theplurality of digital signal output terminals b1-b8 of the plurality ofregisters U0-U3.

The alarm module 700 includes a transistor Q and buzzer LS. A base ofthe transistor Q is electrically connected to the alarm signal outputterminal PC0 of the micro controller. An emitter of the transistor Q iselectrically connected to an anode of the buzzer LS. A collector of thetransistor Q receives the first DC voltage. A cathode of the buzzer LSis grounded. In one embodiment, the transistor Q is a NPN typetransistor.

The power module 800 includes a voltage decreasing circuit 810 and arectification circuit 820. The voltage decreasing circuit 810 includes afuse F and a transformer T. The rectification circuit 820 includes fourdiodes electrically connected together end to end. The voltagedecreasing circuit 810 receives a 220V AC voltage signal and convertsthe 220V AC voltage signal to a 16V AC voltage signal. The rectificationcircuit 820 receives the 16V AC voltage signal and converts the 16V ACvoltage signal to a +16V second DC voltage. The +16V second DC voltageis provided to the refrigerating module 300 and the heating module 400.

In a working state, the power supply 910 is put in the test chamber 900.The temperature detecting unit 100 detects the temperature signals inthe test chamber 900, and transmits the temperature signals to thecontrol unit 200 via the temperature signal input terminal PC0. When thetemperature detecting unit 100 detects the value of the temperaturesignal is less than the predetermined temperature value, the pluralityof second control signal output terminals PA1-PA3 of the microcontroller output high voltage level second control signals to thesecond winding unit M2, the third winding unit M3, and the fourthwinding unit M4. The second winding unit M2, the third winding unit M3,and the fourth winding unit M4 are powered on to close the third switchunit K3, the fourth switch unit K4, and the fifth switch unit K5. Thefirst heating unit 410, the second heating unit 420, and the thirdheating unit 430 receive the +16V second DC voltage and control theplurality of thermal resistors R1-R9 generate heat.

The temperature in the test chamber 900 increases as plurality ofthermal resistors R1-R9 generate heat. When the temperature detectingunit 100 detects the value of the temperature signal is greater than thepredetermined temperature value, the first control signal outputterminal PA0 of the micro controller outputs a low voltage level controlsignal to the first winding unit M1. The first winding unit M1 ispowered on to close the first switch unit K1 and the second switch unitK2. The first refrigerating unit 310 and the second refrigerating unit320 receive the +16V second DC voltage and refrigerate in the testchamber 900 until the value of the temperature signal is equal to thepredetermined temperature value. At least one of the plurality of secondcontrol signal output terminals PA1-PA3 of the micro controller outputsa low voltage level second control signal to the second winding unit M2,the third winding unit M3, and the fourth winding unit M4. At least oneof the second winding unit M2, the third winding unit M3, and the fourthwinding unit M4 is powered off to open the third switch unit K3, thefourth switch unit K4, and the fifth switch unit K5. The value of thetemperature signal in the test chamber 900 keeps the predeterminedtemperature value in the test chamber 900.

Even though numerous characteristics and advantages of the presentdisclosure have been set forth in the foregoing description, togetherwith details of the structure and function of the disclosure, thedisclosure is illustrative only, and changes may be made in detail,especially in the matters of shape, size, and arrangement of partswithin the principles of the disclosure to the full extent indicated bythe broad general meaning of the terms in which the appended claims areexpressed.

What is claimed is:
 1. A power supply test system for testingreliability of a power supply, the power supply test system comprising:a test chamber adapted to accommodate the power supply; a temperaturedetecting unit adapted to detect temperature signals in the testchamber; a control unit adapted to preset a predetermined temperaturevalue and receive the temperature signals; a heating module adapted toreceive a first control signal from the control unit when a value of thetemperature signal is less than the predetermined temperature value; theheating module is adapted to heat the test chamber; and a refrigeratingmodule adapted to receive a second control signal from the control unitwhen a value of the temperature signal is greater than the predeterminedtemperature value; the refrigerating module is adapted to refrigeratethe test chamber until the value of the temperature signal is equal tothe predetermined temperature value.
 2. The power supply test system ofclaim 1, wherein the control unit comprises a micro controllercomprising a first control signal output terminal; the refrigeratingmodule comprises a first relay and a first refrigerating unit; the firstrelay comprises a first winding unit, a first switch unit, and a secondswitch unit; a first terminal of the first winding unit is electricallyconnected to the first control signal output terminal to receive thefirst control signal; a second terminal of the first winding unitreceives a first DC voltage; first terminals of the first switch unitand the second switch unit receive a second DC voltage; and secondterminals of the first switch unit and the second switch unit areelectrically connected to the first refrigerating unit.
 3. The powersupply test system of claim 2, wherein the micro controller furthercomprises at least one second control signal output terminal; theheating module comprises at least one second relay and one first heatingunit; the second relay comprises a second winding unit and a thirdswitch unit; a first terminal of the second winding unit is electricallyconnected to the second control signal output terminal to receive thesecond control signal; a second terminal of the second winding unit isgrounded; a first terminal of the third switch unit receives the secondDC voltage; and a second terminal of the third switch unit is groundedvia the first heating unit.
 4. The power supply test system of claim 3,wherein the first heating unit comprises a plurality of thermalresistors connected to each other in parallel.
 5. The power supply testsystem of claim 1, further comprising a decoding module electricallyconnected to the temperature detecting unit and the control unit, and adisplay module electrically connected to the decoding module; and thedecoding module decodes the temperature signals to temperature valueswhich are displayed on the display module.
 6. The power supply testsystem of claim 5, wherein the micro controller further comprises aserial data signal output terminal; the decoding module comprises atleast one first register and one second register; each of the firstregister and the second register comprises two serial data inputterminals and a plurality of digital signal output terminals; the serialdata signal output terminal is electrically connected to the two serialdata input terminals of the first register; and the two serial datainput terminals of the second register are electrically connected to oneof the digital signal output terminals of the first register.
 7. Thepower supply test system of claim 6, wherein the display modulecomprises at least one first numeral tube and one second numeral tube;each of the first numeral tube and the second numeral tube comprises aplurality of digital signal input terminals; the plurality of digitalsignal output terminals of the first register are electrically connectedto the plurality of digital signal input terminals of the first numeraltube; and the plurality of digital signal output terminals of the secondregister are electrically connected to the plurality of digital signalinput terminals of the second numeral tube.
 8. The power supply testsystem of claim 1, further comprising an alarm module; the microcontroller further comprises a power good signal input terminal and analarm signal output terminal; the power supply comprises a power goodsignal output terminal electrically connected to the power good signalinput terminal; and when the power good signal input terminal fails toreceive a power good signal from the power supply, the alarm signaloutput terminal outputs an alarm signal to the alarm module and thealarm module triggers alarms.
 9. The power supply test system of claim8, wherein the alarm module comprises a transistor and buzzer; a base ofthe transistor is electrically connected to the alarm signal outputterminal of the micro controller; an emitter of the transistor iselectrically connected to an anode of the buzzer; a collector of thetransistor receives the first DC voltage; and a cathode of the buzzer isgrounded.
 10. The power supply test system of claim 1, furthercomprising a power module adapted to convert an AC voltage to the secondDC voltage.
 11. A power supply test system for testing reliability of apower supply, the power supply test system comprising: a temperaturedetecting unit adapted to detect temperature signals of the powersupply; a control unit adapted to preset a predetermined temperaturevalue and receive the temperature signals; a heating module adapted toreceive a first control signal from the control unit when a value of thetemperature signal is less than the predetermined temperature value; theheating module is adapted to heat the power supply; and a refrigeratingmodule adapted to receive a second control signal from the control unitwhen a value of the temperature signal is greater than the predeterminedtemperature value; the refrigerating module is adapted to refrigeratethe power supply until the value of the temperature signal is equal tothe predetermined temperature value.
 12. The power supply test system ofclaim 11, wherein the control unit comprises a micro controllercomprising a first control signal output terminal; the refrigeratingmodule comprises a first relay and a first refrigerating unit; the firstrelay comprises a first winding unit, a first switch unit, and a secondswitch unit; a first terminal of the first winding unit is electricallyconnected to the first control signal output terminal to receive thefirst control signal; a second terminal of the first winding unitreceives a first DC voltage; first terminals of the first switch unitand the second switch unit receive a second DC voltage; and secondterminals of the first switch unit and the second switch unit areelectrically connected to the first refrigerating unit.
 13. The powersupply test system of claim 12, wherein the micro controller furthercomprises at least one second control signal output terminal; theheating module comprises at least one second relay and one first heatingunit; the second relay comprises a second winding unit and a thirdswitch unit; a first terminal of the second winding unit is electricallyconnected to the second control signal output terminal to receive thesecond control signal; a second terminal of the second winding unit isgrounded; a first terminal of the third switch unit receives the secondDC voltage; and a second terminal of the third switch unit is groundedvia the first heating unit.
 14. The power supply test system of claim13, wherein the first heating unit comprises a plurality of thermalresistors connected to each other in parallel; and the power supply ispositioned in a test chamber.
 15. The power supply test system of claim11, further comprising a decoding module electrically connected to thetemperature detecting unit and the control unit, and a display moduleelectrically connected to the decoding module; and the decoding moduledecodes the temperature signals to temperature values which aredisplayed on the display module.
 16. The power supply test system ofclaim 15, wherein the micro controller further comprises a serial datasignal output terminal; the decoding module comprises at least one firstregister and one second register; each of the first register and thesecond register comprises two serial data input terminals and aplurality of digital signal output terminals; the serial data signaloutput terminal is electrically connected to the two serial data inputterminals of the first register; and the two serial data input terminalsof the second register are electrically connected to one of the digitalsignal output terminals of the first register.
 17. The power supply testsystem of claim 16, wherein the display module comprises at least onefirst numeral tube and one second numeral tube; each of the firstnumeral tube and the second numeral tube comprises a plurality ofdigital signal input terminals; the plurality of digital signal outputterminals of the first register are electrically connected to theplurality of digital signal input terminals of the first numeral tube;and the plurality of digital signal output terminals of the secondregister are electrically connected to the plurality of digital signalinput terminals of the second numeral tube.
 18. The power supply testsystem of claim 11, further comprising an alarm module; the microcontroller further comprises a power good signal input terminal and analarm signal output terminal; the power supply comprises a power goodsignal output terminal electrically connected to the power good signalinput terminal; and when the power good signal input terminal fails toreceive a power good signal from the power supply, the alarm signaloutput terminal outputs an alarm signal to the alarm module and thealarm module triggers alarms.
 19. The power supply test system of claim18, wherein the alarm module comprises a transistor and buzzer; a baseof the transistor is electrically connected to the alarm signal outputterminal of the micro controller; an emitter of the transistor iselectrically connected to an anode of the buzzer; a collector of thetransistor receives the first DC voltage; and a cathode of the buzzer isgrounded.
 20. The power supply test system of claim 11, furthercomprising a power module adapted to convert an AC voltage to the secondDC voltage.